Improvement in the manufacture of lead traps



, Patented Aug. 24,1875.

Jive/012202.

F. N. Du BOI-S.

Manufacture of Lead-Traps N. PETERS. PH

UNI ED STATES PATENT FREDERICK N. DU BOIS, OF NEW YORK, N. Y.

'IMP'RO VE'IV'IENT IN THE MANUFACTURE-OF LEAD TRAPS.

Specification forming part of Letters Patent'No- 167,076, dated-August 24, 1875; application filed July 12,1875.

To all whom'it may concern:

Be it known that I, FREDK. N. DU BOIS, of the city, county, and 'State of New York, have invented a new and useful Improvement on a Machine for Making Plumbers Lead Traps; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification.

The nature of my improvement consists in making lead traps, in their finished state, substantially in the same general manner that lead pipe is made, by means of very strong cylinders for holding the lead, and powerful hydraulic pressure for forcing it out through an orifice having the shape of the pipe required, but with this essential difference, that in making ordinary lead pipe the lead is supplied in equal amount to all parts of the orifice at the same time, and the pipe comes out straight; while, to make lead traps by this improvement, the lead is furnished in greater quantity, first on one side of the orifice and then on the other, as it may be desired to make the pipe or trap bend either way. I

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation in detail.

Figure 1 is an end elevation of what may be called the cylinder, and which is to be a thick casting of steel of great strength. Fig. 2 is a sectional longitudinal elevation of the same. Fig. 3 is a cross-section. Fig. 4 is an elevation. Fig. 5 is a sectional elevation of a trap in its finished state.

The same letters refer to correspondin parts in the dilferent figures.

The method of operating the machine is as follows: The steel cylinder, Fig. 2, of which there must be one for each size of trap to be made, is held in a fixed horizontal position, as represented in the drawing, by suitable fastenings. It is then heated by any convenient means to about 400. The ends A andA are now filled with melted lead, which is allowed to cool until the heat is a little below the melting point, when a plunger or ram (not necessarily shown in the drawing) attached to a hydraulic watercylinder is brought against the lead in each end. The

force exerted by one, which will be from twenty thousand to thirty thousand'pounds per square inch on the surface of the lead, is counterbalanced by the other, and drives the lead into'and fills the two upward passages to the circular orifice e and e, Figs. 2 and 3. These two streams of hot and soft, but not melted, lead are kept separate from each other until they arrive near the orifice by the steel core B, Figs. 2 and 3, which has a nut on the bottom to prevent its beingforced upward, and a projection around the top, which forms the inside of the orifice also by the partition P. (Shown by the dotted lines in Fig. 2, and the top of which is shown at e and 0, Fig. 3.) These two partitions are a part of the steel casting, and extend to, and fit close against, the core on its opposite sides, and complete the separation of the two streams of lead, un-

til it is desired to unite them just below the By'a suitable arrangement of the hydraulic machinery in common use in the manufacture of lead pipe the two rams, which fit closely in the ends of the cylinder, Fig. 2, and which force forward the lead, are under easy control of the person operating the machine.

The operation of forming a trap, such as is represented at Fig. 5, is to move forward the two streams of lead with equal speed, and supplying an equal amount of lead to all parts of the orifice, when the lead will be forced out through it, forming a round smooth pipe that will be straight, the soft, hot, and clean lead of the two streams having united inseparably in the space between the top of the partition and the orifice under a pressure varying with different degrees of heat from fourteen thousand to eighteen thousand pounds per square inch. The part of the trap now formed is representedfrom a to b in Fig. 5, and by the dotted lines at the top of Fig. 2,each stream having furnished lead for half of the circumference of the pipe. The speed of the right hand stream is now reduced, and the speed of the left-hand stream increased, the efiect of which is that the side of the orifice at e is supplied with only enough lead to form the short side of a curved pipe, while the other side of the orifice, at e, is supplied with enough lead to form the long side of the curved pipe, and a little more than half of the circumference, the lines of union between the two streams of lead moving toward the side that supplies the least lead. Hence, the pipe is formed by a natural and easy .distribution of the metal, and is free from waves or imperfections. The curve being th us formed from b to 0, the order of speed of the two streams of lead is now reversed, when the same efl'ect takes place in the opposite direction, forming the pipe or trap from c to d, after which the speed of both streams is again made equal, when a straight part is formed, as at first, and which is sawed off at the orifice, a

finished lead trap, 'without a seam, and of equal thickness in all its parts. The operation above described is repeated until the lead in the cylinder is-exhausted, when the rams are withdrawn, and more lead introduced, as at first.

What I claim as my invention is- 1. As an improvement in the art of making lead traps for plumbers use.

FREDK. N. DU BOIS.

Witnesses WM. MGFAUL, RICHARD BABEUF. 

